For all I know, I'm the only person on CGN who didn't know about this 'Rifles and Carbines' manual recently put out by Uncle Sam, but the information is too good not to share. I heard about it from Sofrep:
"Army Training Circular, TC 3-22.9 Rifles and Carbines is chock full of military vitamins and useful information on the M-4 Carbines, written for an 18-year-old with a GED so it is simply written with pictures suitable for coloring. The Army knows a few things about rifles and carbines. This booklet is the result of years of work and is a valuable resource. Think of it as a little tax refund."
A PDF of the manual is available here: https://fas.org/irp/doddir/army/tc3-22-9.pdf
"Army Training Circular, TC 3-22.9 Rifles and Carbines is chock full of military vitamins and useful information on the M-4 Carbines, written for an 18-year-old with a GED so it is simply written with pictures suitable for coloring. The Army knows a few things about rifles and carbines. This booklet is the result of years of work and is a valuable resource. Think of it as a little tax refund."
A PDF of the manual is available here: https://fas.org/irp/doddir/army/tc3-22-9.pdf